| Budget Amount *help |
¥27,820,000 (Direct Cost: ¥21,400,000、Indirect Cost: ¥6,420,000)
Fiscal Year 2013: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2012: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2011: ¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
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| Outline of Final Research Achievements |
To investigate the influence of arcing in the nuclear fusion reactor, experiments were conducted to reveal the effect and conditions of arcing. Material properties of nanostructured tungsten (W) was evaluated, and the influence of arcing in a large experimental reactor JT-60U was investigated. To discuss the initial process of arcing, the effects of helium irradiation on the field electron emission characteristics were experimentally investigated. The motion and the temperature of the generated plasma around the cathode spot were revealed from analysis of arc trail and spectroscopic measurement. The temperature was ~0.8 eV, and the fractal feature of arc spot motion was revealed. In addition, it was shown that the erosion rate of W was about 0.1 mg/C on the nanostructured W.
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